Features: Made of high quality titanium and iron, stable and durable. Deep ball bearings. These bearings are pre-lubricated with grease. Selection of metal material, good quality, long service life. operation, low friction, high performance and long life. Applications: skateboards, roller blade, inline skating, scooter, . Specification: Material: Titanium, iron Color: red, purple, yellow (optional) Options: red ABEC-7, red ABEC-9, purple ABEC-7, yellow ABEC-9 Size(outer diameter*inner diameter*height): 22*8*7mm/0.9*0.3*0.28in Weight: Approx. 94g Package List: 8 x Skateboard Bearing